Furnace.



F. J. BOWMAN.-

FURNACE.

APPLICATION FILED NOV. I0. 1.916.l

1,235,003 .Patented July 3l, .1917.

IN VEN Tof@ f'ffo Jowzmzv E TTof/vfyo narran srnfrns rarnur no;

FREDERICK J. BOWMAN, OF CLEVELAND, OHIO, ASSIGNOR TO THE GRASSELLI CHEMICAL COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

FURNACE.

Application led November 10, 1916.

To all whom 'it may concern:

Be it known that I, FREDERICK J. Bow- MAN, a citizen of the United States, and a resident of Cleveland, county of Cuyahoga, and State of Ohio, have invented a new and useful Improvement in Furnaces, of which the following is a specication, the principle of the invention being herein explained and the best mode in which I have contemplated applying that principle, so as to distinguish it from other' inventions.

The present invention, relating as indicated to furnaces, is of more particular in` terest in connection with a furnace for roasting or refining zinc ore and particularly zinc sullid, which has to be roasted to drive olf sulfur in the form of sulfur dioxid gas. In furnaces used for this purpose the ore is usually fed in to the uppermost of a number of parallel horizontal chambers which are connected with each other, and through which the ore passes from top to bottom. During this passage of the ore it is heated by means of hot gases passing between and around the various parallel horizontal chambers.

The present invention has particular reference to the connections between these chambers, being designed to provide a means for permitting a free flow of material from one chamber to another without obstructing the passage of the sulfur dioxid gas which is evolved from the ore. To the accomplishment of the foregoing and related ends, said invention, then, consists of the means hereinafter fully described and particularly pointed out in the claims.

The annexed drawing and the following description set forth in detail certain mechanism embodying the invention, such disclosed means constituting, however, but one of various mechanical forms in which the principle of the invention may be used.

In said annexed drawing Figure l is a central longitudinal section in a furnace embodying my new invention, and Fig. 2 is an enlarged view also in section, showing one of the connections between two parallel chambers.

In Fig. 1, there is shown a furnace of well-known type which is used for roastingzinc or other ore, this furnace consisting of a plurality of horizontal and parallel roasting chambers l. The lower chambers of this series are inclosed and heated by means of Speceation of Letters Patent.

Patented July 31, 1917.

serial No. 130,529.

lire flues 2 which are connected to a suitable source of supply and which serve to main-.

tain a roasting temperature in these lower chambers. The upper chambers are maintained at approximately the same temperature, although they are not surrounded and separated by means of these hot air ducts. Each of the chambers 1 is provided with an opening 3 at each end; this opening being normally closed by means of a pivoted door 4,' which is capable of being lifted, and which serves for the introduction of a long rake or pushing member, which, when moved through the chamber from end to end serves to forcethematerial therein along the bottom of the chamber and into a passage connecting that chamber with the one below it. I have devised an improved means of feeding the orel into the uppermost chamber l, this means consisting of a hopper 5 of relatively large size connected by means of a straight vertical chute 6 with one end of the chamber 1. The roof of this chamber 1 is thickened beneath the hopper 5 and on each side of the chute 6, thus providing a relatively narrow passage into which the ore is fed. With an inlet chute of this type it is possible to push the material along the bottom of this chamber without difficulty and without the rake or bar riding over the pile of material at the inlet end of the chamber, as is the case in furnaces having inlet chutes of the usual type.

' In Fig. 2 I have shown an improved connection between the chambers, this connection consisting of a diagonal chute 0r opening 7, extending from one end of the upper chamber diagonally toward the center of the chamber below it. The left wall of this opening 7 is formed of one or more blocks of refractory material, and is very much thicker than the bottom of the chambers l, and thus serves to form a deflecting arch against which the ore falling through this opening will pile up. In this way the end of each chamber 1 is effectively sealed against the introduction of the air or the escape of sulfur dioxid gas. Furthermore it is possible to introduce a rake or push member through one of the doors 4c and push the material on the bottom of one of these chambers toward the discharge end without breaking the seal about the end through which the rake is in troduced for more thana second. or two. As soon as the material below the blocksl 7 permitting the formation of pockets in the chambers and without the loss of any appreciable amount of the material.

Other modes of applying the principle of my inventioninay be employed instead of the one explained, change being made as regardsthe mechanism herein disclosed, .provided the means stated, byany of the` following claims ory the equivalent of such statedmeans be employed.

I therefore particularly point out and distinctly claim as-my invention l. In affurnace of the `characterdescribed thel combination f of two horizontal spaced chambers, a conduit connecting such chambers and disposed at an acute angleto each, and a deflect-ing arch member extending into thelower of said-two'chainbers and forniing the lower wall' of said conduit, said arch member forming a ,surface against which the descending material may form a pile to l,

seal suchchamber at thatfpoint.

2.',In a furnace of the character described the combination of two horizontal parallel Copies of ,this patent may he obtained for ve cents each, by ,addressing the Commissioner of, Patents,,

spaced chambers, a conduit extending diagonally from a point adjacent to one end of the upper chamber tothe adjacent yend ofthe lower chamber, and 'a deflecting arch member extending into said lower chamber and forming the lower wall of said conduit, said member also lying on the side of said conduit adjacent to the ends of said lower chamber. and constituting a wall against which the ore will pyramid and seal said chamber.

3. In a furnace ofthe character described, the combination of, a pluralityoffparallel horizontall chambers connected inseries by diagonal passages extendingfr-om onefend` of a chamberto the adjacent end of the next lower chamber,;anfly vdeflectingA arch members extending downwardly from ythe roof of said chamber and disposed to forni the lower endof each at suchpassages, ,said members extending into such chambers to forni a :wall

against which ore maypyramidandseal said chamber.

et. In .a furnace of the character described thecombination ofa horizontal chamber, anV

Signed bycme, this 6th day of November,A

FRED, J. BOWBMN...

Washington, D. C. 

